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Think Addition!
The fastest way to subtract is to think of addition! For 15 - 8, think: 8 + what = 15? Since 8 + 7 = 15, then 15 - 8 = 7. Easy!
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Math — Subtraction to 20
The fastest way to subtract is to think of addition! For 15 - 8, think: 8 + what = 15? Since 8 + 7 = 15, then 15 - 8 = 7. Easy!